Question 246153
2/3*48+1/3*x
2/3*48+1/3*x=70
32+x/3=70
subtract 32 from both sides
x/3=38
x=3*38=114

32+1/3*x=79
subtract 32
x/3=47
multiply by 3
x=3*47=141 
between 114 and 141 inclusive

If it were 1/3 for the midterm and 2/3 for the final.
1/3*48+2/3*x=70
16+2/3x=70
2x/3=54
divide by 2
x/3=27
multiply by 3
x=3*27=81

1/3*48+2/3*x=79
16+2x/3=79
2x/3=63
multiply by 3
2x=189
divide by 2
x=94.5
between 81 and 94.5 inclusive